[desc] Import CREATE_NEW_PROCESS_GROUP flag from subprocess

[cbentejac]

Description

This PR fixes an issue that occurs only on Windows when executing nodes, following #2703.

The CREATE_NEW_PROCESS_GROUP flag must be added to the list of creation flags when doing the Popen to ensure that the process to execute will not be fully detached (and hence will be killable). However, psutil does not contain any creation flags, instead supporting those from subprocess (https://psutil.readthedocs.io/en/stable/#psutil.Popen).

Prior to this PR, attempting to use psutil.CREATE_NEW_PROCESS_GROUP would cause an error on the execution for all the node processes as it did not exist. This PR replaces it by subprocess.CREATE_NEW_PROCESS_GROUP, effectively creating the process with the correct status. It is worth noting that subprocess.CREATE_NEW_PROCESS_GROUP is imported within the if sys.platform == "win32" condition as this flag only exists for Windows platforms.

[Copilot]

Pull Request Overview

This PR addresses a Windows-specific issue by replacing the use of psutil's nonexistent creation flag with subprocess's CREATE_NEW_PROCESS_GROUP flag to ensure that spawned subprocesses can be properly terminated.

• Import the correct flag from subprocess
• Update the process creation arguments in the Windows branch

Comments suppressed due to low confidence (2)

meshroom/core/desc/node.py:4

• [nitpick] The flag is now correctly imported from subprocess; please verify if psutil is still needed elsewhere in this file to avoid any unnecessary imports.

from subprocess import CREATE_NEW_PROCESS_GROUP

meshroom/core/desc/node.py:159

• The change properly resolves the issue on Windows; please ensure through testing that this change does not inadvertently affect process group management on other platforms.

platformArgs = {"creationflags": CREATE_NEW_PROCESS_GROUP}

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 76.74%. Comparing base (006288a) to head (d096fa4).
Report is 9 commits behind head on develop.

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
meshroom/core/desc/node.py	0.00%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2719      +/-   ##
===========================================
- Coverage    76.75%   76.74%   -0.01%     
===========================================
  Files           40       40              
  Lines         6082     6084       +2     
===========================================
+ Hits          4668     4669       +1     
- Misses        1414     1415       +1     

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